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public static void Encrypt(XmlDocument Doc, string ElementName, SymmetricAlgorithm Key)
if (Doc == null)
throw new ArgumentNullException("Doc");
if (ElementName == null)
throw new ArgumentNullException("ElementToEncrypt");
if (Key == null)
throw new ArgumentNullException("Alg");
XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementName)[0] as XmlElement;
if (elementToEncrypt == null)
throw new XmlException("The XML element was not found");
EncryptedXml eXml = new EncryptedXml();
byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, Key, false);
EncryptedData edElement = new EncryptedData();
edElement.Type = EncryptedXml.XmlEncElementUrl;
string encryptionMethod = null;
if (Key is Aes)
encryptionMethod = EncryptedXml.XmlEncAES256Url;
throw new CryptographicException("The specified algorithm is not supported.");
edElement.EncryptionMethod = new EncryptionMethod(encryptionMethod);
edElement.CipherData.CipherValue = encryptedElement;
EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false);
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